How Do I Find Out What Gear Ratio My Ford Has?

Where do I find Axle Ratio in my Ford? Most Fords will be built with a specific set of available Axle Ratio options available from the factory. Mustangs, F150’s and other Fords can have their axle ratio easily identified by reading the sticker on the inside of the driver’s side door jamb.

How do I identify my gear ratio?

Count the number of teeth on the pinion gear and count the number of teeth on the ring gear. Divide the ring gear teeth number by the number of teeth on the pinion. The result is your gear ratio.

How can I tell what gear ratio I have without pulling cover?

With the transmission in neutral, rotate the rear driveshaft by hand. Count the number of driveshaft revolutions required for one revolution of the tire. If the driveshaft turns approximately 3-1/2 times, you have a 3.54 ratio, etc.

What is a 3.73 gear ratio good for?

So, a truck with optional 3.73 gears will tow a heavier trailer than one with 3.55 or 3.21. But it will also use more fuel in all situations because the engine’s rpm will be higher.

What is the difference between 3.73 and 4.10 gear ratio?

3.73, for every 373 rotations of the driveshaft you get 100 rotations of the axle, and for 4.10, for every 410 rotations of the driveshaft you get 100 rotations of the axle. Now, this means that your engine is spinning faster on 4.10 rather than 3.73.

How can you tell the difference between a 3.73 and a 4.10 gear ratio?

The way you can know which gear ratio you have is by counting the number of teeth on the ring gear divided by the number of teeth on the pinion gear. For example, if the ring gear has 37 teeth and the pinion gear has 9 teeth, the ratio is 4.11:1. So for every turn of the ring gear, the pinion will turn 4.11 times.

What does a 4.10 gear ratio mean?

Gear Ratio: the ratio of the ring and pinion gears in the rear axle. So, if you have a 4.10:1 (sometimes 4.10) rear axle, the pinion will turn 4.10 times for every single turn of the ring gear or in other words, for every 4.10 turns of the driveshaft, the rear wheel will spin once.

Where can I find Ford axle ratio?

How Do I Find the Axle Ratio and Limited Slip of My Ford Vehicle?

• Locate the Safety Compliance Certification Label on the driver’s side front or rear door panel.
• Find the word AXLE under the bar code.
• Find the two-digit code under AXLE.

What does the 8th digit in a VIN number mean?

8th Digit: The 8th digit, in this case, a “Z,” is one of my personal favorites. It’s the engine size! So if you were to go to a junkyard, this digit is really helpful for vehicles that had two different engines during the same year. An S10 Truck or an S10 Blazer are perfect examples of this.

What rear diff do I have?

Stamped Number on the Axle
To figure out exactly what axle you have, you can look for the Dana stamped bill of materials number. This stamped number can usually be found on the righthand side or on the longer axletube on the same side of the tube as the differential cover, facing the rear of the truck.

What kind of DIFF do I have?

The easiest way to tell if you have an open differential is to jack up the car and spin one of the rear tires. If the other wheel spins in the opposite direction, you have an open differential. If it spins in the same direction, you have a limited slip differential, or LSD.

Where is the gear ratio stamped?

The axle may have a sticker, and on the differential cover, you might have a small metal tag that’s sticking out that will have the gear ratio stamped on it.

Does gear ratio change with tire size?

Gear Ratio Changes
Changing tire size affects the final drive ratio. Switching from a 30″ tire to a 35″ tire changes the final drive ratio by about 17%. This may drop the engine out of it’s “power band” and result in poor performance and fuel economy.

What gear ratio is best for 35 in tires?

That’s why I run a 4.56 gear ratio with 35″ tires. This gives me decent fuel efficiency at highway speeds, and enough low end power to throttle through difficult obstacles. Below I’ve outlined a gear ratio chart that cross compares tire size to gear ratio for the ideal RPM.

What gear ratio is best for highway?

If getting the best fuel economy is priority, then choose the lowest numerical number offered, such as 3.08, 3.23 or 3.31. This applies to highway driving; city driving mpg isn’t really affected by the axle ratio. If you do a mix of both, go with the “standard” axle ratio offered by the manufacturer.

What is a 4.10 axle ratio good for?

Pickups towing big 5th wheel trailers do well equipped with 4.10:1 axle ratios. The thinking behind the decision to stick with the base axle ratio, which is typically 3.08:1 or 3.42:1, is the ratio comes standard, so that’s what the vehicle manufacturer feels is the best setup.

Is 3.55 or 3.73 gears better?

PERFORMANCE: The larger the axle ratio number, the quicker the truck will accelerate. For example, a truck equipped with 3.55:1 axle gearing will accelerate faster than one equipped with a 3.31 axle ratio. Similarly, a pickup with a 3.73 axle ratio will be faster than one with 3.55s.

What axle ratio is best for speed?

If you are looking for quicker, more nimble performance, an axle ratio of around 3.55 will be ideal. This will cause the engine to make more revolutions per minute and will require less of the throttle to get up to speed.

Is a 4.10 gear ratio good for towing?

A 4.10 rear axle ratio is ideal for towing larger 5th Wheel or Gooseneck trailers. FACT: A 3.73 axle ratio is ideal for towing heavy loads on flat terrain and will produce increased fuel economy during steady-state, long-distance highway driving.

Does a higher gear ratio mean better gas mileage?

Gear ratios can be boiled down to a single statement: Higher ratios (with a lower numerical value) give better torque/acceleration and lower ratios allow for higher top speeds and better fuel economy.

Do bigger tires raise or lower gear ratio?

When changing gears for taller tires, you are heading to a numerically higher gear ratio. The higher the gear ratio, the smaller the pinion gear.